Statistical quality control- mean-range chart

Reference no: EM1393074

1. Statistical Quality Control- Mean and Range Chart

A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality control inspector randomly selected five slugs each hour, measured the outside diameter, and recorded the results. The measurements (in millimeters) for the period 8:00 A.M. to 10:30 A.M. follow:

Outside diameter (mm)

Time 1 2 3 4 5 Mean Range

8:00 87.1 87.3 87.9 87.0 87.0 87.26 0.9
8:30 86.9 88.5 87.6 87.5 87.4 87.58 1.6
9:00 87.5 88.4 86.9 87.6 88.2 87.72 1.5
9:30 86.0 88.0 87.2 87.6 87.1 87.18 2
10:00 87.1 87.1 87.1 87.1 87.1 87.1 0
10:30 88.0 86.2 87.4 87.3 87.8 87.34 1.8

a. Determine the control limits for the mean and the range.

b. Plot the control limits for the mean outside diameter and the range.

c. Are there any points on the mean or the range chart that are out of control? Comment on the chart.

[use Megastat, quality control process charts or use Phstat, mean and range control charts.

Reference no: EM1393074

Questions Cloud

Estimate for proportion-acceptable levels of carbon monoxide : Construct a 99% confidence interval for the proportion of Americans who live in neighborhoods with acceptable levels of carbon monoxide.

Best measure of central tendency for data : For each of the following, identify the scale of measurement (NOIR) and the best measure of central tendency for the data.

What is the speed of the cart if man suddenly starts running : A 1000-kg cart is rolling to the right at 5m/s. A 75-kg man is standing on the right end of the cart. What is the speed of the cart if the man suddenly starts running to the left with a speed of 10.00m/s relative to the cart.

Business-level strategy : Determine how your experience with that company might change if it switched to one of the other four strategies (your choice). Explain your rationale

Statistical quality control- mean-range chart : A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter.

How long does it take the boat to make a round trip : A boat moves through the water of a river at 10-m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.6-m/s.

Core thematic issues in james baldwin-s the fire next time : Write down 1000-word essay which recognizes two of core thematic issues brought up in James Baldwin's "The fire next time."

Effect on aggregate demand and gdp : The necessary change in taxes and government spending and the effect on aggregate demand, GDP, and employment.

Elucidation of the complete human genomic dna sequence : Bacteria have been on the earth for billions of years and were first organisms to inhabit the planet. They continue to be 1st organisms to return to an area after fire and Do you think the elucidation of the complete human genomic DNA sequence has fa..

User Account

All Pages